Pulley and like element



F. H. JOHNSTON AND J. C. CHRISTENSEN.

PULLEY AND LIKE ELEMENT.

APPLICATION FILED OCT. 14, 1918.

1 ,33'7, 1 35 Patented Apr. 13, 1920.7

2 SHEETSSHEET l.

F. H. JOHNSTON AND J. C. CHRISTENSEN.

PULLEY AND LIKE ELEMENT.

APPLICATION FILED OCT. I4. I9l8.

1,337,135. Patented Apr. 13,1920.

2 SHEETSSHEET 2.

UNITED STATES PATENT onnron.

FRANK H. JOHNSTON AND JAMES C. CHRISTENSEN, 0F INDIANAPOLIS, INDIANA.

PULLEY AND LIKE ELEMENT.

Specification of Letters Patent.

Patented Apr. 13, 1920.

Application filed October 14, 1918. Serial No. 258,032.

To all whom it may concern:

Be it known that we, FRANK H. J OHNSTON and JAMES C. CHRISTENSEN, both citizens of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented certain new and useful Improvements in Pulleys and like Elements, of which the following is a specification.

Our invention relates to improvements in laminated pulleys, commonly known as paper pulleys, and more particularly to means for increasing the driving engagement between the laminated rim and the hub or core.

The object of the invention is to simplify and improve the structure of such devices whereby they will be not only cheapened in construction, but will be more eflicient in operation, positive in driving action, easily assembled, and unlikely to get out of repair.

A further object of the invention is to provide a new form of hub or core flange so shaped and arranged as to afford increased driving engagement, and prevent lost motion or play about the connecting bolts.

With the above primary and other incidental objects in view as will more fully appear in the specification, the invention consists of the features of construction, the parts and combinations thereof, and the mode of operation, or their equivalents, as hereinafter described and set forth in the claims.

Referring to the drawings, Figure 1 is a side elevation of an assembled pulley embodying the present invention. Fig. 2 is a transverse sectional view thereof. Fig. 3 is an inside elevation of the free or loose ring or flange. Figs. 4 and 5 are enlarged detail views of the anchor lug. Fig. 6 illustrates a further application of the invention. Figs. 7 and 8 illustrate modifications.

The pulley illustrated in Figs. 1 and 2 is of the web type in which the pulley body comprising the rim portion 1 and the web 2 is mounted upon a metallic hub or core 3. The pulley body has been shown of laminated construction and may be built up from sheets of paper, card, or straw board, fiber, leather, fabric, or other suitable material. This material is turned or otheroperates with an adjustable collar 5, known as the loose flange to clamp the web 2 of the pulley body between the said members4= and 5. This clamping action is effected by means of transverse bolts 6 extending through the said flanges or collars and the intermediate web of the pulley body.

As thus far described the construction is one now in common use. It has a disadvantage however in that when through use or shrinkage the frictional engagement of the collars or flanges 4: and 5 upon the intermediate body is relaxed, a slight play or lost motion is developed about the bolts 6, which cannot ordinarily be made to fit perfectly tight in the web 2, Such play or lost motion gradually increases the size of the bolt holes in the web until the web is weakened and the bolts are torn out. To overcome this disadvantage is one of the primary objects of the present invention.

The hub 3 may be of the usual cylindrical form, but in the drawings has been shown of a special polygonal concaved shape, which is described and claimed in a co-pending application Serial No. 258,031. It is to be understood that this particular form is not essential but is a desirable co-acting element of the present combination. The polygonal concaved hub 3 is of such diameter in relation with that of the bore of the pulley body that the angles of the polygonal hub overhang the initial periphery of the bore. This polygonal hub is forced into the round bore of the pulley body under pressure, causing the projecting angles of the hub to be embedded in the material of the pulley body while the displacement of material by said angles is compensated for by the swelling of the material into the concavity of the polygonal faces, thus materially increasing the driving engagement of the hub and pulley body independent of the clamping action of the collars or flanges 4 and 5.

In the event that the hub is of polygonal form, the opening in the loose collar or flange 5 is of like shape whereby the collar 5 is afforded a positive driving engagement with the hub. This equalizes the torsional strain, and the pulley is driven equally from each collar, or flange, and in addition thereto by the direct engagement of the hub and web, whereas in the usual cylindrical hub and loose collar construction the pulley body is driven wholly from the integral or tight flange.

Formed on the inner faces of the collars or flanges l and 5 and surrounding the holes which receive the bolts 6 is a series of cup shaped bosses 7 the interior recess of which is conical or tapered. As the pulley body is compressed between the flanges or collars, these hollow bosses are embedded in the material of the pulley body thereby affording anchorage which tends to resist the torsional strains, and affords a positive driving engagement between the collars or flanges and the pulley body. In addition to the increased driving engagen'ient of the parts, the'tapered interiors of the bosses 7 as they are embedded in the material of the body portion tend to compress or contract the material tightly about the bolts 6, thereby effecting a tight fit of the material into conformity with the bolt and obviating any play or lost motion which would eventually result in enlargement of the holes and the destruction of the pulley.

While the invention has been shown in Figs. 1 and 2 applied to a. comparatively wide faced pulley, it is to be understood that it is not limited to such use but may be applied to wheels, disks and like elements, the width of which may or may not exceed the distance between the collars or flanges. Such a construction is shown in Fig. 6 in which is shown a frictional. wheel, the rim or channel of which may be perfectly circular as ordinarily constructed, or may be polygonal as is the hub 3. In this figure a collar or loose flange 8 corresponding to the flange 5 of the previous construction serves to clamp the filler 9 intermediate said flange S and a fixed or tight flange 10. The flanges 8 and 10 are provided with the hollow bosses 7 before described, and the inner circumference of the collar 8 may be polygonal to agree with the shape of the rim or seat.

The use of the bosses 7 obviates the necessity of the extensive machining operations or facing of the flanges et-58 and 10, while the employment of the polygonal hub or core avoids the necessity of arcuate machining of the exterior surface of the hub.

In Fig. 7 there is shown a modification in which the rigid or fixed flange 4c is located at a medial point of the hub and in assembling the pulley body is entirely inclosed therein. Two loose flanges or collars 5 are provided, one on each side of the inner or fixed flange i. Both the fixed and loose flanges 4? and 5 are provided with the anchor bosses 7 as before described. Such bosses 7 are located on opposite sides of the inner or fixed flange.

Fig. 8 discloses a construction in which both flanges are loose and are afforded positive driving engagement with the hub by the polygonal form of the hub and correspondingly shaped central openings in the flanges. Otherwise the construction and operation is as before described.

From the above description, it will be apparent that there is thus provided a device of the character described, possessing the particular features of advantage before enumerated as desirable, but which obviously is susceptible of modification in its form, proportions, detail construction or arrangement of parts without departing from the principle involved or sacrificing any of its advantages.

While in order to comply with the statute, the invention has been described in language more or less specific as to certain structural features, it is to be understood that the invention is not limited to the specific details shown, but that the means and construction herein described comprise but one mode of putting the invention into effect, and the invention is therefore claimed in any of its possible forms or modifications within the legitimate and valid scope of the appended claims.

Having thus described our invention, we claim,:-

1. In a machine element, the combination *ith a main body of a hub, opposing flanges carried by the hub intermediate which the main body is clamped, means for drawing said flanges one toward the other, and a plurality of cup shaped driving bosses on the inner or adjacent faces of the flanges adapted to be embedded in the material of the main body.

2. In a machine element, the combination with a main body of a hub, opposing flanges carried by the hub intermediate which the main body is clamped, clamp bolts extending through the said flanges and intermediate the portion of the main body, and cup shaped bosses on the inner faces of the flanges and surrounding the clamp bolts, said bosses being embedded in the material of the main body substantially as and for the purpose specified.

3. In a machine element, the combination with the main body of a hub, opposing flanges carried by the hub intermediate which the main body is clamped, clamp bolts extending through the flanges and intermediate portion of the main body, and means for compressing the material of the main body surrounding said bolts into close conformity therewith.

4. In a machine element, the combination with the main body of a hub, opposing flanges carried by the hub intermediate which the main body is clamped, clamp bolts extending through the flanges and intermediate portion of the main body, and driving bosses having conical recesses located on the inner faces of the flanges and surrounding the clamp bolts, whereby the material forced within the conical interiors of the bosses by the clamping action of the flanges will be contracted into close conformity with the bolts, substantially as specified.

' 5. In a machine element, the combination with a main body, of a hub, a fixed flange and a loose flange carried by the hub, between which the main body projects, said loose flange being interengaged with the hub against rotation thereon but capable of a shifting movement to and from the fixed flange, clamp bolts connecting the flanges adapted to draw the flanges into clamping engagement with the intermediate portion of the main body, and a plurality of eccentric angular flanges upon the inner or adjacent faces of the flanges adapted to be embedded in the material of the main body.

6. A machine element consisting of a main body, a hub or core therein, and clamp flanges carried by the hub between which the main body is engaged, characterized by anchorage flanges eccentrically positioned upon the inner or engaging faces of the clamp flanges adapted to be embedded in the material of the main body.

7. A machine element consisting of a main body, a hub or core therein characterized by one clamp flange fixedly carried by said hub or core and embedded in the material of the main body and two loose flanges carried by the hub or core on opposite sides of the fixed flange and engaging the outer faces of the main body.

8. A machine element consisting of a main body, a hub, or core therein, a flange fixedly carried by said hub or core and embedded in the material of the main body, two loose flanges carried by the hub or core on opposite sides of the fixed flange and engaging the outer faces of the main body, and anchorage projections on both sides of the inner or fixed flange and on the adjacent faces of the loose flanges, substantially as specified.

In testimony whereof we have hereunto set our hands this 17th day of August, A. D. 1918.

Witnesses C. L. Conn,

S. A. CLINoHENs. 

